Hampshire · England
Sand mastic for sash & case windows in Lee, Hampshire
Specialist sand mastic for Lee: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Old sand mastic that has cracked, crumbled or fallen out
- Mastic that needs renewing before redecorating
- Open joints round the window box
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Sash cords, weights and draught-proofing of the sashes
- Decisions on consent for listed homes
- Putty and glazing repairs
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer before you book.
Surfaces we seal
- Tenement windows
- Period & listed homes
- Timber door frames
- Brick reveals
- Sash and case windows
- Stone surrounds
About our sand mastic in Lee
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you’re dealing with draughty sash windows at the surround and mastic that needs renewing before redecorating, we can put it right, whatever the surface.
Around Lee, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Lee (SO51)
- Region
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Other services in Lee
Lee questions
Do you cover smaller places like Lee?
Yes, Lee is covered. We work across London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
I let a flat near Romsey station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Lee.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
What’s sand mastic made of?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
How long does sand mastic take to go off?
Not right away. It skins first and hardens fully later, and we will tell you what to expect.
What happens if it’s left?
An open joint round the frame lets weather in. Water can get to the frame and the masonry, so dealing with it now protects both. Around Lee, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why us?
- Tidy, careful work
- A 12-month guarantee on all work
- We’re fully insured
- Any old sealant cut out fully, not covered over
See what affects the cost and customer reviews.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Do not run silicone over sand mastic
- Leave the new mastic unpainted
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Crumbling mastic lets rain into the joint. That water can reach the timber frame and the wall, so renewing it early is worth it.
Signs you need sand mastic in Lee
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
Common reasons people contact us include:
- Old sand mastic that has cracked, crumbled or fallen out
- Gaps between timber frames and stone or brick
- Wind and rain getting in round a sash window
- Modern sealant on a period surround
In the older streets around Church of St Boniface, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- What guarantee comes with the work
- Are they insured?
- What product goes in the joint
- Who does the work, and how experienced they are
How the job changes by surface
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Sand mastic in Lee: local notes
Lee is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Oasis Academy Lord's Hill, its window and door frames need their mastic kept sound, just like a home’s. Rented homes near Romsey station change hands often, and cracked sand mastic around sash windows lets in the draughts tenants complain about.
Lee is about 2 miles south of Romsey, in Hampshire. Jobs in Lee get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Lee is one of 683 towns and villages in Hampshire we cover for sand mastic.
We cover every part of SO51 for sand mastic. You will find streets such as Lee Lane and Lee Church Lane. If you’re just outside Lee, we cover Ashfield (1 mile east), Toothill (1 mile east), Upton (1 mile south-east), Nursling (1 mile south-east) and Rownhams (2 miles south-east). We also work in nearby towns such as Winchester (10 miles north-east), Eastleigh (6 miles east), Fareham (15 miles south-east), Totton (3 miles south), Chandler's Ford (5 miles north-east) and Hedge End (9 miles east).
What’s near Lee
For rail, the closest station is Romsey station, about 2.4 miles north. Nearby you will also find King Johns House (2.3 miles north) and Romsey Community Hospital (2.3 miles north). Open spaces near Lee include Testwood Lakes.
Should I try it myself first?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes a few hours for a single window, longer for several, depending on how much there is to do. In a small place like Lee, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Getting a quote is simple: let us know what needs doing and where and its rough size. Photos by email help us understand the job.